diff --git a/src/dom/Draggable.js b/src/dom/Draggable.js
index d5d515f3..12586b58 100644
--- a/src/dom/Draggable.js
+++ b/src/dom/Draggable.js
@@ -69,6 +69,9 @@ L.Draggable = L.Evented.extend({
 	},
 
 	_onDown: function (e) {
+		// Ignore simulated events, since we handle both touch and
+		// mouse explicitly; otherwise we risk getting duplicates of
+		// touch events, see #4315.
 		if (e._simulated) { return; }
 
 		this._moved = false;
@@ -102,6 +105,9 @@ L.Draggable = L.Evented.extend({
 	},
 
 	_onMove: function (e) {
+		// Ignore simulated events, since we handle both touch and
+		// mouse explicitly; otherwise we risk getting duplicates of
+		// touch events, see #4315.
 		if (e._simulated) { return; }
 
 		if (e.touches && e.touches.length > 1) {